20671217 has 8 divisors (see below), whose sum is σ = 23784000. Its totient is φ = 17598384.

The previous prime is 20671213. The next prime is 20671241. The reversal of 20671217 is 71217602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20671217 - 2² = 20671213 is a prime.

It is a super-2 number, since 2×20671217² = 854598424522178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20671213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8867 + ... + 10952.

It is an arithmetic number, because the mean of its divisors is an integer number (2973000).

Almost surely, 2^20671217 is an apocalyptic number.

It is an amenable number.

20671217 is a deficient number, since it is larger than the sum of its proper divisors (3112783).

20671217 is a wasteful number, since it uses less digits than its factorization.

20671217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19975.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 20671217 is about 4546.5610080587. The cubic root of 20671217 is about 274.4450162654.

Adding to 20671217 its reverse (71217602), we get a palindrome (91888819).

The spelling of 20671217 in words is "twenty million, six hundred seventy-one thousand, two hundred seventeen".